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Search Results: 1 - 10 of 346 matches for " Yassine Trabelsi "
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Extinction Conditions from a One-Sided Competition Model with a Holling Type I Functional Response for the Sterile Insect Technique  [PDF]
Yassine Chargui, Anis Dhahbi, Adel Trabelsi
Open Journal of Modelling and Simulation (OJMSi) , 2018, DOI: 10.4236/ojmsi.2018.62002
Abstract: The Sterile Insect Technique (SIT) is a powerful biological tool to control pest-populations. It could be integrated in management programmes of the Red Palm Weevil (RPW) Rhynchophorus ferrugineus Olivier. This pest threatens seriously date palms particularly in Saudi Arabia. As a matter of fact, the use of SIT has been very efficient in controlling RPW populations in coconut gardens in various countries. In this work, we outline the extinction conditions of a target wild-population using a one-sided competition model to describe its competition with released sterile insects. We employ a Holling type I functional response to describe the sterile-fertile one-sided competition and we consider two intra-specific competition sub-models, with and without Allee Effect, in modelling the growth of the wild-type population. We also study two manners of liberating sterile insects: single and periodic release strategies.
Changes in six-minute walking distance during pulmonary rehabilitation in patients with COPD and in healthy subjects
Imen Ben Cheikh Rejbi, Yassine Trabelsi, Afef Chouchene, et al
International Journal of Chronic Obstructive Pulmonary Disease , 2010, DOI: http://dx.doi.org/10.2147/COPD.S7955
Abstract: nges in six-minute walking distance during pulmonary rehabilitation in patients with COPD and in healthy subjects Original Research (4780) Total Article Views Authors: Imen Ben Cheikh Rejbi, Yassine Trabelsi, Afef Chouchene, et al Published Date July 2010 Volume 2010:5 Pages 209 - 215 DOI: http://dx.doi.org/10.2147/COPD.S7955 Imen Ben Cheikh Rejbi1, Yassine Trabelsi1, Afef Chouchene1, Wafa Ben Turkia1, Helmi Ben Saad1, Abdelkarim Zbidi1, Abdelhamid Kerken2, Zouhair Tabka1 1Department of Physiology and Lung Testing, Faculty of Medicine of Sousse, Tunisia; 2Department of Biophysics, Faculty of Medicine of Monastir, Tunisia Background: The six-minute walking distance (6MWD) test has demonstrated validity and reliability to assess changes in functional capacity following pulmonary rehabilitation in patients with chronic obstructive lung disease. However, no attempt has been made to establish an iterative measurement of 6MWD during the overall period of pulmonary rehabilitation. Therefore, the aim of this study was to evaluate the impact of a twelve-week rehabilitation program on the iterative weekly measurement of 6MWD in chronic obstructive pulmonary disease (COPD) patients and healthy subjects. Methods: Twenty-six patients with COPD and nine age-matched healthy subjects were studied. Measurements were taken at baseline and after twelve weeks except for the 6MWD. The exercise measurements included a six-minute walking test (6MWT) and an incremental exercise test. Oxygen saturation, heart rate, and dyspnea will be monitored during all these tests. Results: At baseline there were significant differences between groups, except in age, body mass index, and oxygen saturation. After 12 weeks, there was no significant change in lung function in patients with COPD and healthy subjects. The 6MWD, peak oxygen uptake VO2peak and anaerobic threshold increased significantly after training in both groups (P < 0.01). The averaged trace of the 6MWD of patients with COPD and healthy subjects was followed-up respectively by a logarithmic and linear fitting. 6MWD showed a plateau after eight weeks in patients with COPD, however, it increased continually overall in healthy subjects. Conclusion: Both patients with COPD and healthy subjects demonstrated functional responses to training but with somewhat different patterns in quality of the improvement of the 6MWD.
Changes in six-minute walking distance during pulmonary rehabilitation in patients with COPD and in healthy subjects
Imen Ben Cheikh Rejbi,Yassine Trabelsi,Afef Chouchene,et al
International Journal of COPD , 2010,
Abstract: Imen Ben Cheikh Rejbi1, Yassine Trabelsi1, Afef Chouchene1, Wafa Ben Turkia1, Helmi Ben Saad1, Abdelkarim Zbidi1, Abdelhamid Kerken2, Zouhair Tabka11Department of Physiology and Lung Testing, Faculty of Medicine of Sousse, Tunisia; 2Department of Biophysics, Faculty of Medicine of Monastir, TunisiaBackground: The six-minute walking distance (6MWD) test has demonstrated validity and reliability to assess changes in functional capacity following pulmonary rehabilitation in patients with chronic obstructive lung disease. However, no attempt has been made to establish an iterative measurement of 6MWD during the overall period of pulmonary rehabilitation. Therefore, the aim of this study was to evaluate the impact of a twelve-week rehabilitation program on the iterative weekly measurement of 6MWD in chronic obstructive pulmonary disease (COPD) patients and healthy subjects.Methods: Twenty-six patients with COPD and nine age-matched healthy subjects were studied. Measurements were taken at baseline and after twelve weeks except for the 6MWD. The exercise measurements included a six-minute walking test (6MWT) and an incremental exercise test. Oxygen saturation, heart rate, and dyspnea will be monitored during all these tests. Results: At baseline there were significant differences between groups, except in age, body mass index, and oxygen saturation. After 12 weeks, there was no significant change in lung function in patients with COPD and healthy subjects. The 6MWD, peak oxygen uptake VO2peak and anaerobic threshold increased significantly after training in both groups (P < 0.01). The averaged trace of the 6MWD of patients with COPD and healthy subjects was followed-up respectively by a logarithmic and linear fitting. 6MWD showed a plateau after eight weeks in patients with COPD, however, it increased continually overall in healthy subjects.Conclusion: Both patients with COPD and healthy subjects demonstrated functional responses to training but with somewhat different patterns in quality of the improvement of the 6MWD. Keywords: six-minute walking distance (6MWD), chronic obstructive pulmonary disease (COPD), healthy subjects, pulmonary rehabilitation
An Output Stabilization Problem of Distributed Linear Systems Approaches and Simulations  [PDF]
El Hassan Zerrik, Yassine Benslimane
Intelligent Control and Automation (ICA) , 2012, DOI: 10.4236/ica.2012.32018
Abstract: The goal of this paper is to study an output stabilization problem: the gradient stabilization for linear distributed systems. Firstly, we give definitions and properties of the gradient stability. Then we characterize controls which stabilize the gradient of the state. We also give the stabilizing control which minimizes a performance given cost. The obtained results are illustrated by simulations in the case of one-dimensional distributed systems.
Periodic Planar Multilayered Substrates Analysis Using Wave Concept Iterative Process  [PDF]
El Amjed Hajlaoui, Hichem Trabelsi, Henri Baudrand, Hichem Trabelsi, Hichem Trabelsi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.43016
Abstract: Due to the practical importance and difficulties associated with their closed form solutions, the experimental and computational study of periodic planar multilayered structures, such as FSS in multilayered configuration and Multilayered Planar antennas array, are in complementary progress. During the past two decades, the widespread use of such methods has allowed a broad range of important scattering problems involving non-standard shapes, boundary conditions and material composition to be solved. In this sense, an efficient iterative technique based on the concept of wave is presented for computing periodic substrates in multilayered configuration. This paper presents an extensible approach of the iterative method to study multilayered substrates (n layers in which n = 2, 20) with spatial periodicity in multi- layer configuration. Our new approach is performed in order to study 3 dimensional structures by the method called Wave Concept Iterative Process (WCIP). This method is adapted in its original form to study 2 dimensional structures. The third dimension is modulated by transmission line as an approximation for every mode in spectral domain. The utility of the new WCIP appears because of its fast convergence and little consumption in memory.
Comparative study of optical properties of the one-dimensional multilayer Period-Doubling and Thue-Morse quasi-periodic photonic crystals
Yassine Bouazzi
Advanced Electromagnetics , 2012, DOI: 10.7716/aem.v1i3.49
Abstract: The last decades have witnessed the growing interest in the use of photonic crystal as a new material that can be used to control electromagnetic wave. Actually, not only the periodic structures but also the quasi-periodic systems have become significant structures of photonic crystals. This work deals with optical properties of dielectric Thue-Morse multilayer and Period-Doubling multilayer. We use the so-called Transfer Matrix Method (TMM) to determine the transmission spectra of the structures. Based on the representation of the transmittance spectra in the visible range a comparative analysis depending on the iteration number, number of layers and incidence angle is presented.
Travail collaboratif et interactions dans les forums de discussion fermés. Cas d’élèves ingénieurs tunisiens
Yassine Jelmam
Questions Vives : Recherches en éducation , 2011, DOI: 10.4000/questionsvives.545
Abstract: Le e-Learning utilise des pédagogies nouvelles et non conventionnelles qui émanent de sa propre structure ; structure où enseignants et enseignés ne sont pas groupés dans une classe et où le virtuel remplace le réel. Ce nouveau mode d’enseignement intègre dans son fonctionnement la nécessaire prise en compte des interactions entre les différents acteurs de ce système et propose le chat , l’e-mail et les forums de discussion comme alternatives susceptibles de remplacer les interactions dans une classe classique. Mais qu’en est-il vraiment ? Et comment rendre ces outils efficaces et garants de bons apprentissages ? Le recherche empirique que nous présenterons, qui a touché 52 étudiants appelés à mettre en place un travail en groupe partant d’un forum de discussion et dont nous avons suivi les échanges, montre que les interactions entre apprenants sont à l’origine de partage, de collaboration et de co-construction de savoirs. E-Learning uses new and unconventional teaching methods because of its own structure. In this structure teachers and students are not grouped in a class and the virtual "replace" the real. To be operational this new teaching method requires interaction between different actors and proposes chat rooms, e-mail and discussion forum as alternatives to classical classroom interactions. But what happens in the reality? How can we sure these tools are efficient to ensure a good learning? The empirical research in this paper gathered 52 students to set up a working group drawn from a discussion forum. We followed their exchanges to show that interactions between learners are responsible for sharing, collaboration and co-construction of knowledge.
Pédagogie et didactique à l’épreuve de la modernité
Yassine Zouari
Questions Vives : Recherches en éducation , 2011, DOI: 10.4000/questionsvives.237
Abstract: Nous nous proposons, dans cet article, d’étudier les rapports entre pédagogie et didactique sous l’angle des métamorphoses de la modernité éducative. La question que nous soulevons consiste à chercher en quoi les pédagogies modernes et les didactiques des disciplines puisent leurs rationalités de référence dans la modernité. En recourant à une méthodologie interprétative, nous essayons de valider l’hypothèse suivante : bien que pédagogie et didactique s’inscrivent dans un processus de rationalisation de l’éducation consubstantiel à la modernité, chacune de ces deux approches est sous-tendue par une figure prédominante de la raison moderne, à savoir la rationalité praxéologique, en ce qui concerne la pédagogie, et la rationalité cognitive, pour ce qui relève de la didactique. C’est ainsi que se comprend leur divergence quant à la manière d’envisager la question du sens des pratiques enseignantes. In this article we study the connections between pedagogy and didactics regarded through the educative modernity metamorphoses. We intend to discover how modern pedagogies and the didactics of disciplines draw their rationalities from the modernity. Using an interpretative methodology, we attempt to validate the following hypothesis: even if pedagogy and didactics are inscribed in a rationalizing educational process consubstantial with modernity, each of these two approaches is subtended by a different predominant figure of modern reason, the praxeological rationality for pedagogy and the cognitive rationality for the didactics. That’s how we can understand their diverging approaches of the sense of teaching practices.
Collaborative Work and Interactions in a Closed Discussion Forums. Case of the Tunisian Engineering Students
Jelmam Yassine
International Journal of Advanced Corporate Learning (iJAC) , 2011, DOI: 10.3991/ijac.v4i2.1490
Abstract: E-Learning uses unconventional and new pedagogies that emanate from its own structure. Structure where teachers and students are not grouped in a classroom and where the virtual "replace" the real. This new mode of teaching includes the need to take into account interactions between different actors in the system and provides the "chat", the "mail" and "discussion forums" as alternatives that could "replace" interactions in a classic classroom. But what is it really? And how to make these tools efficient and guarantying good leanings ? The empirical research that we will present and which affected 52 students called to set up a working group drawn from a discussion forum that we followed. The results shows that interactions between learners are responsible for sharing , collaboration and co-construction of knowledge.
Mechanisms of NF-?B activation in asthmatic bronchi
Amrani Yassine
Respiratory Research , 2001,
Abstract:
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